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Cormogeny :: Cormogeny (n.) The embryological history of groups or families of individuals.

Trimethylamine :: Trimethylamine (n.) A colorless volatile alkaline liquid, N.(CH3)3, obtained from herring brine, beet roots, etc., with a characteristic herringlike odor. It is regarded as a substituted ammonia containing three methyl groups..

Foil :: Foil (n.) The space between the cusps in Gothic architecture; a rounded or leaflike ornament, in windows, niches, etc. A group of foils is called trefoil, quatrefoil, quinquefoil, etc., according to the number of arcs of which it is composed..

Odontornithes :: Odontornithes (n. pl.) A group of Mesozoic birds having the jaws armed with teeth, as in most other vertebrates. They have been divided into three orders: Odontolcae, Odontotormae, and Saururae..

Prognathi :: Prognathi (n. pl.) A comprehensive group of mankind, including those that have prognathous jaws..

Family :: Family (v. t.) A group of kindred or closely related individuals; as, a family of languages; a family of States; the chlorine family..

Homology :: Homology (n.) The correspondence or resemblance of substances belonging to the same type or series; a similarity of composition varying by a small, regular difference, and usually attended by a regular variation in physical properties; as, there is an homology between methane, CH4, ethane, C2H6, propane, C3H8, etc., all members of the paraffin series. In an extended sense, the term is applied to the relation between chemical elements of the same group; as, chlorine, bromine, and iodine are said

Branchiura :: Branchiura (n. pl.) A group of Entomostraca, with suctorial mouths, including species parasitic on fishes, as the carp lice (Argulus)..

Dentirostral :: Dentirostral (a.) Having a toothed bill; -- applied to a group of passerine birds, having the bill notched, and feeding chiefly on insects, as the shrikes and vireos. See Illust. (N) under Beak..

Member :: Member (n.) Any part of a building, whether constructional, as a pier, column, lintel, or the like, or decorative, as a molding, or group of moldings..

Acrania :: Acrania (n.) The lowest group of Vertebrata, including the amphioxus, in which no skull exists..

Cincinnati Epoch :: Cincinnati epoch () An epoch at the close of the American lower Silurian system. The rocks are well developed near Cincinnati, Ohio. The group includes the Hudson River and Lorraine shales of New York..

Hydrazine :: Hydrazine (n.) Any one of a series of nitrogenous bases, resembling the amines and produced by the reduction of certain nitroso and diazo compounds; as, methyl hydrazine, phenyl hydrazine, etc. They are derivatives of hydrazine proper, H2N.NH2, which is a doubled amido group, recently (1887) isolated as a stable, colorless gas, with a peculiar, irritating odor. As a base it forms distinct salts. Called also diamide, amidogen, (or more properly diamidogen), etc..

Retitelae :: Retitelae (n. pl.) A group of spiders which spin irregular webs; -- called also Retitelariae.

Stylus :: Stylops (n.) A genus of minute insects parasitic, in their larval state, on bees and wasps. It is the typical genus of the group Strepsiptera, formerly considered a distinct order, but now generally referred to the Coleoptera. See Strepsiptera..

Anoplura :: Anoplura (n. pl.) A group of insects which includes the lice.

Type :: Type (n.) A general form or structure common to a number of individuals; hence, the ideal representation of a species, genus, or other group, combining the essential characteristics; an animal or plant possessing or exemplifying the essential characteristics of a species, genus, or other group. Also, a group or division of animals having a certain typical or characteristic structure of body maintained within the group..

Tetratomic :: Tetratomic (a.) Having a valence of four; quadrivalent; tetravalent; sometimes, in a specific sense, having four hydroxyl groups, whether acid or basic..

Hastings Sands :: Hastings sands () The lower group of the Wealden formation; -- so called from its development around Hastings, in Sussex, England..

Entomophaga :: Entomophaga (n. pl.) One of a group of hymenopterous insects whose larvae feed parasitically upon living insects. See Ichneumon, 2..

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